The work was due to be completed on Saturday 27 September; however the last shift was completed on Sunday 21 September.
Highways Agency Asset Manager Kevin Bown said:
The resurfacing was completed in just three weeks and is now providing drivers with smoother and safer journeys. Finishing early has reduced the disruption to local residents and the thousands of drivers who rely on this route.
We were able to finish the work early thanks to the close co-operation and hard work of all those involved, including Kent County Council, Dover District Council, Kent Police, Dover Harbour Board and our contractors. We also appreciate the patience of residents and businesses that contributed to the success of this work.
The work was carried out by LaFarge Tarmac on behalf of the Highways Agency and follows the 2008 scheme.
The work started on Monday 1 September and was carried out overnight, between 8pm and 6am.
A public exhibition was held at Dover Town Hall on Wednesday 6 August.
Members of the public should contact the Highways Agency Information Line on 0300 123 5000.
Journalists should contact the Highways Agency press office on 0844 693 1448 and use the menu to speak to the most appropriate press officer.